I'd say start with the best rifle you can afford, and get the add ons later.
As I tell people when they're buying their first AR, get to know the weapon bone stock, there is no substitution for marksmanship skills.
Then you can get a scope and all the other trinkets thet'll make it tacticool, and be confident that if the scope breaks you can still hit your target.

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Hold my beer and watch this!